GNU bug report logs - #31641
26.1; iter-do variable not left unused warning

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Package: emacs;

Reported by: Christopher Wellons <wellons <at> nullprogram.com>

Date: Tue, 29 May 2018 13:13:01 UTC

Severity: minor

Tags: confirmed, fixed

Found in version 26.1

Fixed in version 28.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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From: Christopher Wellons <wellons <at> nullprogram.com>
To: 31641 <at> debbugs.gnu.org
Subject: bug#31641: 26.1; iter-do variable not left unused warning
Date: Tue, 29 May 2018 09:12:30 -0400

When byte-compiling an iter-do form with a variable intended to be left 
unused, the compiler emits a false warning:

;;; -*- lexical-binding: t; -*-
(require 'generator)
(iter-do (_ i))
;; -> "Warning: variable ‘_’ not left unused"

Giving the variable a name has the opposite effect, though it's not 
a false warning in this case:

(iter-do (v i))
;; -> "Unused lexical variable ‘v’"

This issue does not occur with similar, long-established forms:

;;; -*- lexical-binding: t; -*-
(dolist (_ '(a b c)))
(dotimes (_ 10))
;; -> no warnings
This bug report was last modified 4 years and 111 days ago.

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